JP6547439B2 - Decorative sheet and decorative board - Google Patents

Description

  The present invention relates to a decorative material and a decorative board that can be used for interior materials, furniture, and the like.

  In the case of decorative materials used for applications such as building interior materials such as floors, walls and ceilings, fittings such as doors, surface materials such as furniture, surface properties such as abrasion resistance and contamination resistance are generally required. Furthermore, since oil resistance is also required for cosmetic materials to be attached to the outer surfaces of kitchens and cupboards, oil-resistant cosmetic printing sheets using thin paper impregnated with a resin have been proposed (Patent Documents 1, 2 and 3, 3).

Patent No. 4388112 gazette Patent No. 4735171 gazette Patent No. 5229340

However, oil-resistant cosmetic materials proposed as prior art have not necessarily completely satisfied surface properties such as oil resistance. From the above points, there is a demand for a cosmetic material having high oil resistance, inconspicuous oil stain, and satisfying surface physical properties. Moreover, general paper can be used, and there is no cosmetic material having sufficient oil resistance regardless of gloss, top coat and oil repellent.
Then, this invention is made in view of said situation, and an object of this invention is to provide the decorative sheet and decorative board which are not conspicuous in an oil stain and satisfy surface physical properties, such as oil resistance.

In order to solve the above-mentioned subject, a decorative sheet concerning one mode of the present invention contains a metallic pigment which has aluminum flakes as a main ingredient on base paper, and has a concealment rate 95% or more, and a printing layer. And the resin layer are laminated in this order.
A decorative board according to an aspect of the present invention is characterized in that the decorative sheet is attached to a substrate.

  According to one aspect of the present invention, it is possible to obtain a decorative sheet and a decorative board in which oil stains are not noticeable and surface physical properties such as oil resistance are satisfied.

It is sectional drawing which shows the laminated structure of the decorative sheet which concerns on embodiment of this invention. (A) is a cross-sectional view showing a case where the resin layer is three layers, (b) is a case where the resin layer is two layers, and (c) is a case where the resin layer is one layer. It is sectional drawing which shows the laminated structure of the decorative board which concerns on embodiment of this invention.

Embodiment
Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimension, the ratio of the thickness of each layer, and the like are different from actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description.
In addition, the embodiments described below illustrate apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention includes materials, shapes, structures, and arrangements of component parts. Etc. are not specified in the following. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(Cosmetic sheet)
As shown in FIG. 1, the decorative sheet (cosmetic material) 10 according to the present embodiment contains a metal pigment mainly composed of aluminum flakes on the base paper 1 (for example, the surface side of the base paper 1) and the concealment rate The masking layer 2, the printing layer 3, the pattern layer 4, and the resin layer 5 are laminated in this order. However, as the decorative sheet 10 according to the present embodiment, a single-color decorative sheet or the like without the pattern layer 4 can be appropriately selected. That is, although the arrangement of the picture layer 4 between the printing layer 3 and the resin layer 5 is also characteristic, the picture layer 4 is not essential.

Moreover, aluminum flakes are flakes of aluminum. The aluminum flake is, for example, a scale-like foil piece of aluminum. Aluminum flakes can provide a sense of gloss by reflecting light.
The shape of the aluminum flakes in plan view is, for example, spherical, the size in plan view is, for example, in the range of 3 to 20 μm, and the thickness is, for example, 3 to 20 μm. Moreover, content of the aluminum flakes in a concealing layer is 5-60 micrometers, for example. The degree of dispersion of the aluminum flakes in the concealing layer is, for example, a degree that prevents the variation in the base material visually confirmed.

(Base paper 1)
The base paper 1 is a paper base whose main raw material is pulp or the like. Here, although the paper base material used as the base material of the base paper 1 has wood pulp fiber as a main component from easiness of acquisition etc., you may use the non-wood pulp fiber other than that. Wood pulp includes softwood kraft pulp, hardwood kraft pulp, chemical pulp such as sulfite pulp, stone grind pulp, thermomechanical pulp, refiner grind pulp mechanical pulp, or regenerated from newspaper, coated paper, wood free paper, etc. Pulp can be used. Moreover, these can also be mix | blended suitably and it can also be used. In the present embodiment, for example, general paper is used as the base paper 1.

  In addition, before providing the masking layer 2 on the surface side of the base paper 1, prebaking is performed to dry the base paper 1 at 120 ° C. or higher. This is to remove the water contained in the base paper 1. It is preferable that the base paper 1 has a value (hereinafter referred to as "water content") measured by JIS P 8203 (paper, paperboard and pulp-measurement method by absolute dryness-method by dryer) is less than 7%. If the moisture content is less than 7%, moisture in the interior of the paper substrate can be sufficiently removed, so that warping or cracking of the decorative sheet due to deformation of the base paper 1 can be prevented. However, if the moisture content is 7% or more, removal of moisture inside the paper substrate is insufficient, and warpage or cracks of the decorative sheet due to deformation of the base paper 1 may occur.

(Hiding layer 2)
The concealing layer 2 is a layer provided between the base paper and the printing layer for the purpose of preventing the color of the substrate from being transmitted and visible on the printing paper by oil stains. The concealing layer 2 according to the present embodiment contains a metal pigment mainly composed of aluminum flakes, and the concealing rate is 95% or more. The masking layer 2 is a uniform member which covers the entire surface of the base paper 1.

The concealing layer 2 according to the present embodiment is made of a urethane resin. That is, a urethane resin is used as a binder resin in the ink used to form the masking layer 2.
The basic composition of the ink used for formation of the concealing layer 2 is four components of the metal pigment which has an aluminum flake as a main component, binder resin, a solvent, and an adjuvant. Binder resin transfers and fixes metal pigment to base paper 1, wet and stable dispersion of metal pigment, imparts an appropriate viscosity to ink and facilitates transfer to base paper 1, forms a film after transfer, and adheres to base paper 1. It is an important material that has four functions, and determines the ink performance. The solvent is used for dissolving the binder resin, imparting an appropriate viscosity to the ink, adjusting the drying speed, and the like. Representative solvents include toluene, MEK (methyl ethyl ketone), ethyl acetate and the like. A mixture of binder resin and solvent is called a vehicle (developer). Auxiliary agents are added to the ink for imparting various functions, imparting ink stability (dispersant, antioxidant, ultraviolet absorber), imparting printability (defoamer, antistatic agent), ink film The purpose is to improve physical properties (plasticizers and lubricants).

  In the present embodiment, as the binder resin, a highly elastic polyurethane that follows a film having excellent adhesion and flexibility to various films is used. The polyurethane is obtained by curing a polyol component and an isocyanate component (curing agent) by a polyaddition reaction. Polyurethane has polar groups such as urethane bond and urea bond, and has excellent adhesion. It also exhibits excellent solubility in non-aromatic solvents such as ethyl acetate and MEK. Thus, the binder resin using polyurethane has excellent adhesion and solvent solubility. Thus, the masking layer 2 according to the present embodiment contains a urethane resin.

At present, acrylic polyol is mainly used as a polyol component, and polyurethane having acrylic polyol as a main component is called acrylic urethane. That is, the masking layer 2 can be made of an acrylic resin composition. For example, an acrylic resin can be used as a binder resin in the ink used to form the masking layer 2.
As an acrylic resin, for example, polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, ethyl (meth) acrylate-butyl (meth) Acrylate copolymer, methyl (meth) acrylate-styrene copolymer, etc. can be used. Here, (meth) acrylate means acrylate and methacrylate. Moreover, in order to improve oil resistance, it is also preferable to surface-treat the above-mentioned resin so as to be hydrophilic. These resins can be used singly or in combination of two or more.

  In addition, it is preferable to use a two-component curable acrylic resin containing a polyol component as the above acrylic resin from the viewpoint of improving oil resistance. The main component of the two-component curable acrylic resin is usually an acrylic resin in which one or more functional groups having reactivity with an isocyanate group such as a hydroxyl group or a carboxyl group are introduced in the molecule in a number of two or more. Resin is used. For example, in the case where the functional group is two or more hydroxyl groups, the acrylic resin is also referred to as an acrylic polyol. As such a hydroxyl group-containing acrylic resin, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (meth) acrylate- (meth) acrylic acid with one or more kinds of (meth) acrylic acid alkyl ester monomers such as n-butyl, isobutyl (meth) acrylate, octyl (meth) acrylate and ethylhexyl (meth) acrylate (Meth) acrylic acid ester monomers having a hydroxyl group in the molecule, such as hydroxyethyl 2-hydroxyethyl, (meth) acrylic acid 2-hydroxypropyl, (meth) acrylic acid 2-hydroxy-3-phenoxypropyl, etc. Obtained by copolymerizing one or more kinds and, if necessary, another vinyl monomer such as a styrene monomer Polymers. In addition, (meth) acrylic acid is the meaning of acrylic acid or methacrylic acid.

Moreover, when introduce | transducing a carboxyl group, the copolymer etc. which copolymerized carboxyl group-containing vinyl monomers, such as acrylic acid and methacrylic acid, are used.
In addition, in order to exhibit concealability, titania (titanium dioxide) may be contained in the above-mentioned acrylic resin composition. In particular, it is preferable to contain titania having an oil absorption of 17 to 36 g / 100 g as measured according to JIS K 5101 (linseed oil). Although the oil resistance is reduced by the inclusion of the titania, when the oil absorption is within this range, the decrease in oil resistance is small, and good concealability can be obtained. From the above points, the oil absorption is more preferably in the range of 17 to 22 g / 100 g.

The content of titania is preferably in the range of 40 to 85% by mass in a dry state in the resin composition. When the content is 40% by mass or more, sufficient hiding power is obtained, while when the content is 85% by mass or less, sufficient strength as a layer is obtained, and printability is also good. From the above point, the range of 50 to 80% by mass is more preferable.
In addition, about the concealability of concealment layer 2, when putting a decorative sheet on concealment test paper and measuring with a spectrocolorimeter, it is a value computed by the following formula (henceforth "the concealment rate") Is 95% or more. If the concealment rate is 95% or more, the concealability is extremely good because the base is not visible (or almost invisible).

[a formula]
Concealment ratio = (Y value measured at black portion of concealed test paper / Y value measured at white portion of concealed test paper) × 100 [%]
Y value: Stimulus value (brightness)
In the acrylic resin composition, in addition to metal pigments mainly composed of aluminum flakes, colorants such as pigments and dyes, extender pigments, solvents, stabilizers, plasticizers, catalysts, curing agents, etc. are appropriately mixed. be able to.

  As colorants, inorganic pigments such as carbon black (ink), iron black, titanium white, antimony white, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, cobalt blue, etc., quinacridone red, isoindolinone yellow, phthalocyanine Organic pigments such as blue or dyes, metal pigments composed of flakes such as brass, titanium dioxide coated mica, pearlescent pigments composed of flakes such as basic lead carbonate, etc. are used.

  As an isocyanate component used as a hardening | curing agent, the polyvalent isocyanate which has a 2 or more isocyanate group in a molecule | numerator is used suitably. For example, aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, 4,4-diphenylmethane diisocyanate, or aliphatic isocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate are used. Be

Although the thickness of the masking layer 2 is not particularly limited, it is in the range of 10 μm to 25 μm as a whole, for example. When the thickness of the concealing layer 2 is 10 μm or more, the penetration of the oil component into the base paper 1 can be prevented, and sufficient oil resistance and concealability can be ensured. On the other hand, if the thickness of the masking layer 2 is 25 μm or less, it is advantageous in terms of printability, designability, manufacturing cost, and processability.
The concealing layer 2 preferably has a Wangan-type air permeability of 4000 seconds or more. That is, the lower limit of the Wang Jian-type air permeability of the concealing layer 2 is set to 4000 seconds. Although the upper limit of the Oken type air permeability is not particularly determined, it is determined in accordance with the manufacturing restrictions. In order to set the Wang Jian air permeability to 4000 seconds or more, the coating amount of the entire masking layer 2 (the total of the respective printing layers when the masking layer 2 is a multilayer) is preferably 30 g / m ² or less. Moreover, it is preferable to perform the process which equalizes the surface of the masking layer 2 with a stick | rod, a cylinder, etc., and is made smooth (smooth). When the coating amount of the masking layer 2 is 30 g / m ² or less and the surface of the masking layer 2 is smooth, the Oken type air permeability is 4000 seconds or more, and the adhesion between the layers is good. If the coating amount exceeds 30 g / m ² or if the surface of the masking layer 2 is not smooth, the Oken type air permeability may not reach 4000 seconds or more. In addition, even if the Oken type air permeability is 3000 seconds or more and less than 4000 seconds, the adhesion between the layers is sufficient and there is no problem in practical use. However, if the Oken type air permeability is less than 3000 seconds, the adhesion between the layers may be insufficient.

(Printed layer 3)
The printing layer 3 is provided for the purpose of enhancing the design of the decorative sheet, and is a uniform member which covers the entire surface of the base paper 1. Although the printing layer 3 is usually formed in an opaque color in many cases, it is formed in a colored and transparent manner, and may take advantage of the pattern possessed by the base. Moreover, when utilizing that white paper 1 is white, it may be formed colorless and transparent.

The print layer 3 according to the present embodiment is made of a urethane resin. That is, as a binder resin in the ink used to form the print layer 3, a urethane resin is used.
The basic composition of the ink (printing ink) used for formation of the printing layer 3 is four components, a colorant, a binder resin, a solvent, and an adjuvant. Colorants are materials that impart color to printing inks and are generally divided into pigments and dyes. The binder resin is used to transfer and fix the colorant to the masking layer 2, to wet and stably disperse the colorant, to impart appropriate viscosity to the printing ink, to facilitate transfer to the masking layer 2, to form a film after transfer. It is an important material that has the four functions of being in close contact with 2 and that determines the performance of the printing ink. The solvent is used for dissolving the binder resin, imparting an appropriate viscosity to the printing ink, adjusting the drying speed, and the like. Representative solvents include toluene, MEK (methyl ethyl ketone), ethyl acetate and the like. A mixture of binder resin and solvent is called a vehicle (developer). Auxiliary agents are added to the printing ink for various functions, ink stability imparting (dispersant, antioxidant, UV absorber), printability imparting (defoamer, antistatic agent), ink The purpose is to improve film physical properties (plasticizer, lubricant).

  In the present embodiment, as the binder resin, a highly elastic polyurethane that follows a film having excellent adhesion and flexibility to various films is used. The polyurethane is obtained by curing a polyol component and an isocyanate component (curing agent) by a polyaddition reaction. Polyurethane has polar groups such as urethane bond and urea bond, and has excellent adhesion. It also exhibits excellent solubility in non-aromatic solvents such as ethyl acetate and MEK. Thus, the binder resin using polyurethane has excellent adhesion and solvent solubility. As described above, the print layer 3 according to the present embodiment contains a urethane resin.

At present, acrylic polyol is mainly used as a polyol component, and polyurethane having acrylic polyol as a main component is called acrylic urethane. That is, the printing layer 3 can be composed of an acrylic resin composition. For example, an acrylic resin can be used as a binder resin in the ink used to form the print layer 3.
As an acrylic resin, for example, polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, ethyl (meth) acrylate-butyl (meth) Acrylate copolymer, methyl (meth) acrylate-styrene copolymer, etc. can be used. Here, (meth) acrylate means acrylate and methacrylate. Moreover, in order to improve oil resistance, it is also preferable to surface-treat the above-mentioned resin so as to be hydrophilic. These resins can be used singly or in combination of two or more.

  In addition, it is preferable to use a two-component curable acrylic resin containing a polyol component as the above acrylic resin from the viewpoint of improving oil resistance. The main component of the two-component curable acrylic resin is usually an acrylic resin in which one or more functional groups having reactivity with an isocyanate group such as a hydroxyl group or a carboxyl group are introduced in the molecule in a number of two or more. Resin is used. For example, in the case where the functional group is two or more hydroxyl groups, the acrylic resin is also referred to as an acrylic polyol. As such a hydroxyl group-containing acrylic resin, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (meth) acrylate- (meth) acrylic acid with one or more kinds of (meth) acrylic acid alkyl ester monomers such as n-butyl, isobutyl (meth) acrylate, octyl (meth) acrylate and ethylhexyl (meth) acrylate (Meth) acrylic acid ester monomers having a hydroxyl group in the molecule, such as hydroxyethyl 2-hydroxyethyl, (meth) acrylic acid 2-hydroxypropyl, (meth) acrylic acid 2-hydroxy-3-phenoxypropyl, etc. Obtained by copolymerizing one or more kinds and, if necessary, another vinyl monomer such as a styrene monomer Polymers. In addition, (meth) acrylic acid is the meaning of acrylic acid or methacrylic acid.

Moreover, when introduce | transducing a carboxyl group, the copolymer etc. which copolymerized carboxyl group-containing vinyl monomers, such as acrylic acid and methacrylic acid, are used.
In addition, in order to exhibit concealability, titania (titanium dioxide) may be contained in the above-mentioned acrylic resin composition. In particular, it is preferable to contain titania having an oil absorption of 17 to 36 g / 100 g as measured according to JIS K 5101 (linseed oil). Although the oil resistance is reduced by the inclusion of the titania, when the oil absorption is within this range, the decrease in oil resistance is small, and good concealability can be obtained. From the above points, the oil absorption is more preferably in the range of 17 to 22 g / 100 g.

The content of titania is preferably in the range of 40 to 85% by mass in a dry state in the resin composition. When the content is 40% by mass or more, sufficient hiding power is obtained, while when the content is 85% by mass or less, sufficient strength as a layer is obtained, and printability is also good. From the above point, the range of 50 to 80% by mass is more preferable.
In addition, about the concealability of the printing layer 3, when putting a decorative sheet on concealment test paper and measuring with a spectrocolorimeter, it is the value calculated by the following formula (henceforth "the concealment rate") Is preferably 80% or more. If the concealing rate is 80% or more, the concealing property is good because the base can not be seen (or very hard to see). In addition, even if the concealing rate is 75% or more and less than 80%, since the base is difficult to see, the concealing property is sufficient and there is no problem in practical use. However, if the concealment rate is less than 75%, the base is easily visible and the concealability is insufficient.

[a formula]
Concealment ratio = (Y value measured at black portion of concealed test paper / Y value measured at white portion of concealed test paper) × 100 [%]
Y value: Stimulus value (brightness)
In the acrylic resin composition, in addition, colorants such as pigments and dyes, extender pigments, solvents, stabilizers, plasticizers, catalysts, curing agents and the like can be appropriately mixed.

  As colorants, inorganic pigments such as carbon black (ink), iron black, titanium white, antimony white, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, cobalt blue, etc., quinacridone red, isoindolinone yellow, phthalocyanine Organic pigments such as blue or dyes, metal pigments composed of flakes such as aluminum and brass, and pearlescent pigments composed of flakes such as titanium dioxide coated mica and basic lead carbonate are used.

  As an isocyanate component used as a hardening | curing agent, the polyvalent isocyanate which has a 2 or more isocyanate group in a molecule | numerator is used suitably. For example, aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, 4,4-diphenylmethane diisocyanate, or aliphatic isocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate are used. Be

The thickness of the print layer 3 is not particularly limited, but it is in the range of 10 μm to 25 μm as a whole, for example. When the thickness of the print layer 3 is 10 μm or more, the penetration of the oil component into the base paper 1 can be prevented, and sufficient oil resistance and concealability can be ensured. On the other hand, when the thickness of the printing layer 3 is 25 μm or less, it is advantageous in terms of printability, designability, manufacturing cost, and processability.
The printing layer 3 preferably has a Wangan-type air permeability of 4000 seconds or more. That is, the lower limit of Wangan-type air permeability of the print layer 3 is set to 4000 seconds. Although the upper limit of the Oken type air permeability is not particularly determined, it is determined in accordance with the manufacturing restrictions. In order to make the Wang Jian air permeability not less than 4000 seconds, it is preferable that the coating amount of the entire printing layer 3 (the total of each printing layer when the printing layer 3 is a multilayer) is 30 g / m ² or less. Moreover, it is preferable to perform the process which levels the surface of the printing layer 3 with a stick | rod, a cylinder, etc., and is made smooth (smooth). The coating amount of the printing layer 3 is 30 g / m ² or less, and if the surface of the printing layer 3 is smooth, the Oken type air permeability is 4000 seconds or more, and the adhesion between the layers is good. If the coating amount exceeds 30 g / m ² or if the surface of the printing layer 3 is not smooth, the Oken type air permeability may not reach 4000 seconds or more. In addition, even if the Oken type air permeability is 3000 seconds or more and less than 4000 seconds, the adhesion between the layers is sufficient and there is no problem in practical use. However, if the Oken type air permeability is less than 3000 seconds, the adhesion between the layers may be insufficient.

(Pattern layer 4)
The pattern layer 4 is for imparting a design with a desired pattern on the surface side of the printing layer 3, and the type of pattern and the like are not particularly limited. For example, grain patterns, grain patterns, grain patterns, tile patterns, brick pile patterns, grain patterns, skin patterns, geometric figures, characters, symbols, abstract patterns and the like can be mentioned.

The method for forming the pattern layer 4 is not particularly limited. For example, colored ink obtained by dissolving (or dispersing) a known colorant (dye or pigment) together with a binder resin in a solvent (or dispersion medium), coating It may be formed by a printing method using an agent or the like.
Examples of coloring agents include inorganic pigments such as carbon black, titanium white, zinc flower, red iron oxide, red iron oxide, azo pigments, lake pigments, anthraquinone pigments, quinacridone pigments, phthalocyanine pigments, isoindolinone pigments, dioxazine pigments And organic pigments such as aluminum powder and bronze powder; pearlescent pigments such as titanium oxide-coated mica and bismuth oxychloride; fluorescent pigments; nightlight pigments and the like. These colorants can be used alone or in combination of two or more. For example, pigments such as isoindolinone, polyazo, and phthalocyanine may be blended and added so as to express a desired color tone. Furthermore, fillers such as silica, extender pigments such as organic beads, neutralizing agents, surfactants and the like may be added to these colorants.

  As the binder resin, for example, acrylic resin, styrene resin, polyester resin, urethane resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, alkyd resin, petroleum Examples thereof include system resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, cellulose derivatives, rubber resins and the like. These resins may be used alone or in combination of two or more.

  Examples of the solvent (or dispersion medium) include petroleum-based organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane and methylcyclohexane; ethyl acetate, butyl acetate, acetic acid-2-methoxyethyl, acetic acid-2 -Ester-based organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol and propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone Organic solvents; Ether solvents such as diethyl ether, dioxane, tetrahydrofuran, etc .; Dichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene Inorganic solvents and the like, such as water; chlorinated organic solvents. These solvents (or dispersion media) can be used alone or in combination of two or more.

  Examples of the printing method used to form the pattern layer 4 include gravure printing, offset printing, screen printing, flexo printing, electrostatic printing, and inkjet printing. In the case of forming the solid pattern layer 4 over the entire surface, for example, roll coating, knife coating, air knife coating, die coating, lip coating, comma coating, kiss coating, flow coating, dip coating Various coating methods such as a coating method can be mentioned. In addition, the hand-painting method, the ink flow method, the photography method, the transfer method, the laser beam drawing method, the electron beam drawing method, the partial vapor deposition method such as metal, the etching method, etc. good.

(Resin layer 5)
The resin layer 5 is also referred to as a surface protective layer or a coating layer (coating layer) for protecting the surface of the printing layer 3 or the pattern layer 4 and covers the entire surface of the printing layer 3 or the pattern layer 4 It is a uniform member.
The resin layer 5 according to the present embodiment is made of a urethane resin. That is, the method of forming the resin layer 5 is not particularly limited, but can be formed by a coating method such as gravure coating or roll coating. In this case, a urethane resin is used as a binder resin in the coating liquid.

The urethane resin preferably contains a two-component curable urethane resin as a resin component. Substantially, those formed of this resin are preferred. When the resin layer 5 is formed of a two-component curable urethane resin, the abrasion resistance, impact resistance, contamination resistance, abrasion resistance, weather resistance and the like of the decorative sheet can be easily improved.
The type of the two-component curable urethane resin is not particularly limited, but among them, a polyol component having an OH group as a main component (acrylic polyol, polyester polyol, polyether polyol, epoxy polyol, etc.) and an isocyanate component as a curing agent component (tri And the like. (Diisocyanate, hexamethylene diisocyanate, metaxylene diisocyanate etc.) can be used.

The resin layer 5 may contain, as necessary, a weathering agent, a plasticizer, a stabilizer, a filler, a dispersant, a colorant such as a dye, a pigment, a solvent, and the like. As a weathering agent, an ultraviolet absorber, a hindered amine light stabilizer, etc. are preferable, for example. These weathering agents can be used alone or in combination of two or more.
Examples of UV absorbers include benzophenone UV absorbers, benzotriazole UV absorbers, and triazine UV absorbers. As the light stabilizer, for example, hindered amine light stabilizers are suitable. Although the content of these weathering agents is not limited, it may be about 1000 ppm or more and 10000 ppm or less in the resin layer 5 for both the ultraviolet absorber and the light stabilizer.

The resin layer 5 can be formed, for example, by applying an ionizing radiation curable resin or a two-component curable urethane resin by a known coating method such as gravure coating or roll coating, and then curing the resin. In the case of an ionizing radiation curable resin, the resin is cured by electron beam irradiation.
The resin layer 5 which concerns on this embodiment is comprised by one layer or more and three layers or less. In FIG. 1, the first resin layer 5a, the second resin layer 5b, and the third resin layer 5c are illustrated as the resin layer 5 composed of one layer or more and three layers or less. Here, in order from the lower layer, the first resin layer 5a is the first layer, the second resin layer 5b is the second layer, and the third resin layer 5c is the third layer.

  For example, as shown to Fig.1 (a), when the resin layer 5 is comprised by three layers, a decorative sheet is made the 1st resin layer 5a, the 2nd resin layer 5b, and 3rd resin as the resin layer 5 And a layer 5c. Moreover, as shown in FIG.1 (b), when the resin layer 5 is comprised by two layers, a decorative sheet has the 1st resin layer 5a and the 2nd resin layer 5b as the resin layer 5. As shown in FIG. Further, as shown in FIG. 1 (c), when the resin layer 5 is formed as a single layer, the decorative sheet has only the first resin layer 5 a as the resin layer 5.

  About the formation method of the resin layer 5 which concerns on this embodiment, the 1st resin layer 5a is first apply | coated to the surface side of the printing layer 3 or the pattern layer 4, and it is dried. Next, in the case of providing the second resin layer 5b, after the first resin layer 5a is dried, the second resin layer 5b is applied to the surface side of the first resin layer 5a and dried. Next, in the case of providing the third resin layer 5c, after the second resin layer 5b is dried, the third resin layer 5c is applied to the surface side of the second resin layer 5b and dried.

In the case of overlapping and applying the resin, if the resin is overlaid on the upper layer before the lower layer resin is dried, blocking occurs due to excessive build up of the resin, reversion of the resin once dried (re-adhesion phenomenon), etc. There is something to do. When blocking occurs, the resin in the lower layer is scratched when the resin in the upper layer is peeled off.
In the present embodiment, the formation of the resin layer 5 as described above can suppress the occurrence of blocking.

(Dressing board)
As shown in FIG. 2, the decorative plate 30 according to the present embodiment includes the decorative sheet 10 described with reference to FIG. 1 and a substrate 20. For example, the decorative sheet 10 is attached to the upper surface side of the substrate 20 via an adhesive or the like (not shown). In addition, although the case where the resin layer 5 of the decorative sheet 10 in the decorative board 30 is one layer is shown in FIG. 2, also in this decorative board 30, the resin layer 5 is not limited to one layer, As shown in FIGS. 1 (a) and (b), two or three layers may be used.

(Effect of this embodiment)
(1) The decorative sheet 10 according to the present embodiment includes, on the base paper 1, a masking layer 2, a printing layer 3, and a resin that contains a metal pigment containing aluminum flakes as a main component and has a hiding ratio of 95% or more. Layers 5 and 5 are stacked in this order. This makes it possible to provide a decorative sheet and a decorative board in which the oil stain is not noticeable and the surface physical properties are satisfied.

(2) The base paper 1 is, for example, general paper. Thereby, the material cost can be reduced as compared with the case of using a special material as a base material. Therefore, it is possible to reduce the manufacturing cost of a decorative sheet and a decorative board.
<Other embodiments>
Although the present invention has been described by the above embodiments, it should not be understood that the description and the drawings, which form a part of this disclosure, limit the present invention. Various alternative embodiments, examples and operation techniques will be apparent to those skilled in the art from this disclosure. That is, in practice, the present invention is not limited to the above-described embodiment, and changes in the scope without departing from the scope of the present invention are included in the present invention.

  Hereinafter, Examples 1 and 2 (see Table 1) of the present invention and Comparative Examples 1 and 2 (see Table 2) will be described.

Example 1
The ink for forming the concealing layer 2 was coated on the base paper 1 having a basis weight of 28 g / m ² . This coating was carried out by gravure printing so that the application amount of ink containing 50% of aluminum flakes by dry weight was 6.2 g / m ² . Next, the base paper 1 after coating was dried with warm air at 120 ° C. for 3 minutes. Thereby, the concealing layer 2 in which the concealment rate is 99.0% was provided.
Next, an ink containing 70% of titanium dioxide was applied as a printing layer 3 by gravure printing so that the coating amount would be 17 g / m ^2, and then hot air drying was performed at 120 ° C. for 3 minutes.
Next, as a resin layer 5, a urethane resin containing 10% of silica is applied by gravure printing to a coating amount of 6.7 g / m ^2, and then hot air drying at 120 ° C. for 3 minutes to obtain a gloss value Obtained a decorative sheet of 14.2%.

(Example 2)
The ink for forming the concealing layer 2 was coated on the base paper 1 having a basis weight of 28 g / m ² . This coating was carried out by gravure printing so that the application amount of ink containing 50% of aluminum flakes by dry weight was 6.2 g / m ² . Next, the base paper 1 after coating was dried with warm air at 120 ° C. for 3 minutes. Thereby, the concealing layer 2 in which the concealment rate is 99.0% was provided.

Next, an ink containing 70% of titanium dioxide was applied as a printing layer 3 by gravure printing so that the coating amount would be 17 g / m ^2, and then hot air drying was performed at 120 ° C. for 3 minutes.
Next, after coating the pattern layer 4 by gravure printing, hot air drying was performed at 120 ° C. for 3 minutes.
Next, as a resin layer 5, a urethane resin containing 10% of silica is applied by gravure printing to a coating amount of 6.7 g / m ^2, and then hot air drying at 120 ° C. for 3 minutes to obtain a gloss value Obtained a decorative sheet of 13.5%.

(Comparative example 1)
A decorative sheet was obtained in the same manner as in Example 1 except that the masking layer 2 was not provided.
(Comparative example 2)
A decorative sheet was prepared in the same manner as in Example 1 except that the coating weight was 6.2 g / m < ² > in a concealing layer containing 30% of aluminum flakes as a dry weight.
(Performance evaluation)
Next, performance evaluation of each decorative sheet obtained in Examples 1 and 2 and Comparative Examples 1 and 2 will be described.

<Glossy value evaluation>
The gloss value of the surface of each of the decorative sheets obtained in Examples 1 and 2 and Comparative Examples 1 and 2 was measured with a 60 degree reflection gloss meter to evaluate the gloss value. Here, the case where the gloss value is 3% or more and 60% or less is regarded as good as a design, and the case where less than 3% or more than 60% is regarded as defective.
○: 3% or more and 60% or less ×: less than 3% or more than 60%

<Oil resistance evaluation>
The filter paper was fully impregnated with canola oil, and the filter paper was placed on the surface of the decorative sheet obtained in Examples 1 and 2 and Comparative Examples 1 and 2 and left at room temperature for 24 hours. Next, the filter paper was removed, and the canola oil remaining on the surface of the decorative sheet was removed with a Kimwipe and then visually observed.
The judgment criteria were evaluated as follows.
;: There is no contamination remaining 軽 微: There is contamination remaining but it is minor but no problem in practical use. X; Contamination remains remarkably and spreads throughout the paper

<Hiding rate evaluation>
A decorative sheet was placed on the concealed test paper, and measurement was performed with a spectrocolorimeter, and the case where the value calculated by the following formula was 95% or more was regarded as good (note that the concealment rate in Examples 1 and 2) Was 99.0%, but it was confirmed that the same result as in Examples 1 and 2 would be obtained if the concealment rate is 95% or more.

(Y value measured in black area of concealed test paper / Y value measured in white area of concealed test paper) × 100 [%]
○: concealment rate 95% or more ×: concealment rate less than 95% (results)
As can be seen by comparing Tables 1 and 2, in Examples 1 and 2 of the present invention, oil stains are not noticeable and surface physical properties such as oil resistance are satisfied as compared with Comparative Examples 1 and 2.

DESCRIPTION OF SYMBOLS 1 Oil-resistant paper 2 concealment layer 3 printing layer 4 pattern layer 5 resin layer 5a 1st resin layer 5b 2nd resin layer 5c 3rd resin layer 10 decorative sheet 20 substrate 30 decorative plate

Claims (3)

On the base paper, a concealing layer containing a metal pigment mainly composed of aluminum flakes and having an concealing rate of 95% or more, a printing layer, and a resin layer are laminated in this order ,
Decorative sheet according to claim Rukoto that having a pattern layer between the resin layer and the printed layer.   The decorative sheet according to claim 1, wherein the base paper is a general paper. Decorative board having the decorative sheet according to claim 1 or claim 2, characterized in that affixed to the substrate.

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